Warp-tension equalizer



Oct. 25, 1927. 1,646,446

T. C. DEMERS WARP TENSION EQUALIZER Filed Dec. 1. 1926 3 Sheets-Sheet} 1 1646 446 5' 2 "r. c. DEMERS WARP TENSION EQUALIZER Filed Dec. 1, 1926 :5 sheets-sheen 2 1,646,446 'r. c. DEMERS WARP TENS ION EQUALIZER Filed Dec. 1926 3 Shets-Sheet 3 Patented Oct. 25.1927; 6 1

UNITED STATES PATENT OFFICE-"P msnnsrnonn c. DEVMERS, or LEBANON, NEW HAMPSHIRE.

I VTAEP-TENSION EQUALIZER.

provide means whereby the brake band may be quickly released from the beam head and re-applied thereto without necessitating a re-adjustment to obtain t-he desired tension. The invention also has for its object the provision of a shock absorber which may be quickly and easily removed from the shoe and in which play orback .lash will be eliminated, the, invention seeking further to simplify the construction of the shock absorber without any loss of efficiency. Other objects will appear incidentally in the course of the followingdescription, and the invention resides in certain novel features which will be particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is an end elevation of a portion of a loom adjacent the warp beam showing one embodiment of the present invention;

Fig. 2 is a plan view, with parts in section, of the device; I i

i Fig. 3 is an enlarged front elevation with parts in section;

Fig. 4 is a longitudinal section;

Fig. 5 is a detail section on the line 55 of Fig. 4;

Fig. 6 is an enlarged detail plan view of a portion of the brake. shoe, and

Fig. 7 is an enlarged detail end elevation of the cam for releasing the brake band from the beam head.

In the drawings, the reference numeral-1 indicates a portion of a loom-frame to which is rigidly secured a bracket 2 which extends upwardlv and inwardly therefrom and is provided at its upper end with a shelf 3, the purpose of which will hereinafter appear.

The beam head 4 is of any approved construction and is secured upon the trunnion 5 of the warp beam in the usual or any convenient manner. Resting upon the beam head is a brake shoe 6 which is provided at one end with a laterally projecting lug 7 having a notch 8 in its outer end. To the opposite end of the shoe 6 is secured one end of a brake band 9 which is preferably of resilient metal and is carried under the beam head so as toebear against the same and terminates in eyes 10 receiving a stud be held in a set position.

Application fiIed December 1, 1926. Serial No. 151,972.

or pin-11, upon, which is pivotally mounted: a tenslon bolt or screw 12 in a weui ewn. manner. The tension bolt or screw 12 ex tends through the noteh 8 at'the end of the shoe and is equipped at its upper extremity with a wing nut 13 acting upon a tension 7 spring 1d coiled around the bolt or screw between the nut and the lug 7 whereby the 1 band 9 may be drawn into yieldable frietional contact with the beam head in the usual manner. Carried by the lug 7 and ex{ tending outwardly therefrom is abase jplate, 15 which supports the lower end of' the spring 14, as clearlyshown in the drawings, and on the said base plate at an intermediate pointin' the length thereof and beyond an end of-the lug] is a postj16, Pivotally mounted upon the upper end of the sai d post s a release finger 1?,the inner end of which is forked, as shown at 1 8, and spans the screw or bolt 12 to engage and bear upon the spring 14. The outer end of the said finger 17 is turned downwardly, as shown at 19, and an eccentric 'or cam 20 is pivotally mounted upon the said down-turned end 19 with its periphery arranged 1wbear upon the end of ,thebase plate 15, as shown. This cam or eccentric 20-is carried by a smooth stud 21 having its head 22 countersunk in the outer side of the eccentric, and in the periphery of the eccentric are grooves 23 extending longitudinally'thereof and adapted to engage a stop 24 mounted in the end of the base plate 15 whereby the eccentric-will It is to be no served thatthe grooves 23 have their walls beveled or inclined so that the grooves are V-shaped and theend of the stop 24 is tapered orconical so that, while the engagement ofthe end of the stud in any one'of the grooves will hold the eccentric against accidental release, theapplication of slight force to the eccentric will overcome the restraining influence of the stop and permit or openings 25 as may be most convenient when the parts have been initially set."

When it is desired, for'any reason, to re;

lease the brake band fromthe'beain head,

as, for instance, when the warpis" to T the beam head.

18 thereof will compress the portion oi the spring 14: between the same and the base plate, thereby releasing the band 9 from thebeam head. lVhen the warp has been rearranged, a quick tap upon the handle member 26 will restore the eccentric 20 to its initial position and permit the spring 14 to exert the same tension as before upon the band. The operation is repeated at the opposite end of the warp beam and a start without a light or a heavy place in thecloth is assured. It will be understood, of course, that a beam head and the parts cooperating therewith is supplied at each end of the warp beam, and the unreleased brake band will hold the warp until the released band has been again placed in engagement with The shoe 6 is equipped on its under side with the usual metal lining plate 27 which extends from the lug 7 to the opposite end of the shoe and has one end extended partly under the said lug and permanently.secured thereto by a countersunk-screw 28, as shown clearly in Fig. 4. Near the lug 7, the shoe is: constructed with a short longitudinally extending slot 28 receiving the body of a stud 29 which is upset against or riveted to the plate 27, also asshown in Fig. 4. Bearing against the outer side of the shoe is a i a washer 30 which is held in place by a head edscrew 31 inserted through the washer to engage the stud 29, and the said washer, as shown in Fig. 6, has the same contour as the slot 28 but is slightly wider so that itwill overlap the walls of the slot and constitute an abutment for, the screw head. When the parts are assembled in the work. ing position, the washer preferably extends across the slot, as shown in Fig. 6, and the screw is turned home against the washer sothat the plate 27 will be held firmly to the inner concave surface of the shoe. Should the beam head become worn or for any other reason there should be an imprope i fit between the plate 27 and the (ill beam head, a shine plate 32 is fitted between the shoe and the plate very easily and quickly. To accomplish this result, the screw 31 isloosened and the plate 27 is thus permitted to'slightly separate from the shoe, remaining attached thereto, however, by the screw 28.. The shim plate is constructed in one edge with a notch 33 of sufficient width to pass around the stud 29 and it will,

therefore, be seen that, after the lining plate 27 has been released in the manner described,

' the shim plate may be inserted edgewise between the lining plate and the inner surface of the shoe with the notch alined with the stud and may be pushed laterally into position, after which theylining plate may be pressed back against the shim plate and all the partsreturned to the position shown in Fig. 6. The shim plate can thus be easily fitted in place without requiring the removal of the tension device from the beam head and one ormore shim'plates may be inserted as may be necessary.

The shoe is so arranged with respect to I the beam head that the tension bolt 12 and the parts :iissociated therewith will be presented at the rear side of the loom while the end of the shoe to which "the brakeband 9 isattached will be presented forwardly. In-

pivotal movement toaccomniodate itseltto the varying angular relations between the plunger and the loom frame as the tension device moves with the beam head. The plunger is longitudinally split or slotted, as shown at 37, in its rear portion, the front end of the slot coinciding with the pivot holes to receivethe pin 36 and the walls of the slot are'adjiisted toward each other by a clamping screw 38 inserted diametrically through the plunger across the. slot whereby, when the screw is turned home,- the plunger will be compressed and held in the proper frictional engagement with the pivot pin. I also provide set screws 39 mounted in the. front sides of the respectivelugs or bosses 34; and turned home against the pivot so that movement between the pivot and the bosses will, be checked; Itwill be understood that the set screws 39 and the clamping screw 38 willbe adjustcdso as to eliminate all lost motion between the pivot and the bosses and the plunger respectively but will not bind upon the engaged parts to such an. extent as to lock them against all relative movement. Firmly securednpon the shelf 3 is abox like casting into which the. front end of the plnngerd35 projects. This casting has an opening 40 in its back wall .41 to admit the plunger and the said opening extends through the outer edge of said wall, as shown clearly in Fig. 3. The corresponding side of the castingis entirely open, as shown .at42j in Fig. 2, while the front wall 43 of the casting serves as an abutment to plunger in the operation of the mechanism. A side wall 414: extends between the inner edge of thefront wall 43 and the back ,wall 43 and the back wall :41 for the same purpose, it being noted that the casting. entirely encloses the front end of the plunger and theparts associated therewith,

. except at the outer side of the casting and the said parts are, consequently, protected against damagefrom possible accidental con.- tact with other parts of the loom while at the same time they are accessible from the outside of the loom and. may be easily removed when necessary. The back wall 41 of the box-like casting projects above the top wall 45 of the same, and to the rear side ofithe' said wall is secured a guidingand retaining plate 46, the. lower end of which is arcuate, as shown at 47, wherebylt may fit around the reduced end 48 of a collar 49 which is secured upon the plunger ad acent the front end of the same and extends through therecess or notch 40 in the said wall 41. .Cooperating with the retaining and guiding plate 46 is a lower guide plate 50 secured to the wall 41 ofthe box-like casting and projecting above the lower side of the recess or notch 40 to engage the collar 49,

aremount'ed pick-adjusting nuts 52-which are in threaded engagement with the end of the plunger and are set so that, when the parts are at rest, the distance between the abutment front wall 43 of the box-likecasting and the nuts will be equal to the entent: ofmovement of the warp in one pick; j Fitted upon the plunger loosely and bearing against the 'rear facesof the plates 46 and 50'is awasher 53 and bearing against the rear side of the said washer and encircling the plungor is a" short'sleeve 54 whichmay, if preferred, be formed integral with the said washer '53. Theplungerhas a short 'Ithread ed portion which is normally disposed at the rear end of the: sleeve 54, and uponjthis threaded portion are mounted adjusting nuts 55 which are set to impart the desired tension to a spring 56 which is housed within the said sleeve 54"and is shown as a compression spring coiled around the plunger but may be 'a spring band or a soft wooden block or any other preferred form of buifer or cushion 'or shock absorber according-to the requirements of any given conditions. The nuts 55, aswell as thenuts 52, are pror a wrench when they are tobe turned and the desired adjustment thereby attained; The pick-adj usting vnuts may be vadjusted accurately so as to obtain a very fine adjustment ofthe let-ofi' mechanism, it being possible to setthe said nutsa quarter of aninch or more from, the abutment andzalso tobring them against the abutment or within a few 'thousandths of an inch fromit.

In the operation of the loom, there.- is a Wellknown tendency to impart a jerky or intermittent movement to the warp beam.

The tension device moves with" the Warp beam so as to retain the desired tension movement of the warp beam isnot overs come theweaving is uneven so that thick or thin places occur in the cloth. When the beam moves, under this'intermittent impulse, the plunger 35 will move forwardly until the pick-adjusting nuts or the end of the plunger impinges against the abutment 43 providedby the front wall of the box-like casting, the movement being.- yieldably checked by the spring 56 so that the jerk upon-the warp beam is absorbed and the warp is, consequently, permitted-t0 pass to the harness and other mechanism of the loom in an even steadymanner, As soon as the strain'upon the warp beam is released, the spring 56 will'expandand, consequently return the plunger and the shoe 6 with the cooperatingdevices to the initial-position, thereby overcoming all tendency of the warp tofeed irregularly and eliminating the thick or thin places in the cloth; If it should be necessary, for any-reason,'to re-* move the plunger and the p artsmounted thereon from'the brake shoe 6, the retaining plate-46 is raised so-that it will be entirely clear of the. reduced end of thefcollar49:

The :pivot pin 36 is then withdrawm whereupon the-plunger with-the "nuts, the collar 49, the spring 56 and its housing may be removed laterally -through the 'open'side of the-bo -like casting," the plunger being, of course, tilted so that it Willjclear th'e'lugs 01' bosses 34. -The assembly can be just as easily and quickly returned to the operative vposition by moving the plunger inwardly through the open side of the box-like casting, this facility' of removal and replace; me'nt being advantageous when -i t-'-is desired to change thewarp beam or replace or a'd just the cushion device. v A

claim I i Having thus described the invention'al lio 1. In an apparatus for the purpose set forth, the combination' ofajbrake shoe. a

brake band attached at one end to the shoe and equipped at its opposite end withya' tension bolt and a tension spring cooperating with the end of the shoe to yieltlably retain the band under a desired tension,--al rocking finger carried-by the shoe andengageduat one end with the said spring, and

and the said bearing member, a spring coacting with the said bolt to maintain the tension upon the brake band, a finger mounted for rocking movement upon the said bearing memberand engaged at'one end withthe spring, and an eccentric pivotallyumounted upon the outerend ofthe finger-and engaged with the said bearing member whereby to rock the finger and compress thespring to permit release of the brake band. i w I In an apparatus for the purpose set forth, the combination of a brake shoe," a' brakeband attachedat one end to one end of the shoe, a tension device carried by the free :endoflthe band and cooperating with the opposite end of the shoe, said tension device including aspring, a base plate projecting from the last-mentioned end of the shoe, arocking"fingenmounted between its ends upon" said base plateand having its forward. end engaged with the said spring, an eccentric pivotally mounted upon the rear endof the finger and-bearing upon the base plate,-means ifor rocking the said eccentric, and means for yieldably retaining the eccentricvin a set position. 7 W 4., In an apparatus for the purposeset forth, the combination ar brake shoe, a brake bandattached at one'end tooneend ofthe shoe, a tension device carried by the opposite end of the brake band and cooperating with i I the corresponding end'of the shoe,said tenmeans for checking the pivotalmovementofi the plunger, an abutment arranged in the; P th tim v m ef plu ge adj ent sion device including compression 1 spring, a base 'Jplateprojecting from the said end of: the shoe, a post on saidbaseplat'e beyond:

the end of the shoe, arockingfi'ngermountedupon the' said post and having its front endwengaged with the said spring, anIeccentric pivoted upon therear end of the said finger and bearinguponthe base plate, said eccentric-being provided with longitudinally extending, spaced ,V-shaped grooves in its'periphely, and a taperedlstop element on the; base plate arranged to engage in one ofsaid a set positiona 5..Inanapparatus grooves to yieldably retain the eccentric'in for the; purpose i set fortln-the combination of a brake shoe, ten-1 sion; devices cooperating with the said shoe,

a plunger disposed, normallytangential to the, shoe and pivotally connected} therewith.

the front end of the same, and plunger guiding and retaining means associated with said abutment. i

6. In an apparatus for the purpose set forth, the combination of a brake shoe, tension devices associated with the brake shoe, a pair of lugs onthe-brake'shoe between the ends of the same, a plunger dispose'dbetween the said lugs and pivotally secured thereto. means for frictionally limiting the pivotal movement of the plunger, an abutment ar ranged in advance of the plungeriand in the path of movement thereof, plunger guiding:

and retaining means associated with the abutment, and a yieldable element arranged adjacent the plunger guiding and retaining means andoperating to check the forward movement of the plunger and imparting rearward movement thereto 'to return the same to itsinitial position r r i 7; In an apparatus for the purpose" set forth, the combination: of abrake shoe, ten? sion devices cooperating withthe brake shoe, spaced bosses on the shoe, a plunger disposed between' and pivoted to the bosses, set,

screws mounted. in the bossesand engaging the pivotal support of the :plunger whereby to check the, pivotal movement of the same, the plunger. being longitudinally slotted through its rear portion, a, clamplngelement engaged through the plunger to set the wallsof the slotted portion toward each other, an abutment adjacent the front end of the plunger and in the path :of the same, plunger guiding and. retaining means associated with: the abutment, and-means for yieldably checking the"xforward movement of theplungler and imparting a return rear-- ward movement thereto; a

8. In an apparatus for the purpose set, fOltllyt-lie combination of a brake shoe, a

tension device cooperating with the brake shoe,=a plungerpivotally mounted upon the brake shoe and normally disposedjtangential thereto, a b oxlike member rigidly supported aboutthe forward zendwof the plunger, the

said member having an open outer side to facilitate removal or insertion of the plunger and having la front. wall constituting an abutment forthe plungenmeansmounted on I said 'member'for guiding and retainingthe plunger, and means for yieldably checking;

Ill)

the forward movement! of the plunger and imparting a "return:--rearward movement.

thereto. a a

.9. In an apparatus for the purpose set;

forth, the; combination "of a brake shoe, a

tension device cooperatingwithpthe brake) shoe, a plunger pivotally mounted upon the brake shoe, a box-like memberhousingthe frontendof the plunger and having a front wall constituting an abutment for'the plunger, nuts mounted on the frontiendof the plunger to impinge against the said abutment and adjustable longitudinally 00f the plunger to define the range of its movement, guiding and retaining elements secured upon the box-like member and engaged with the plunger to guide and support the same in its movement, an expansion'element disposed in rear of the said guiding and retaining elements, and means on the plunger for adjusting the tension of the said elementof the plunger, said housing having a partconstituting an abutment for the plunger. impact nuts mounted upon the front end of the plunger and adjustable toward and from the said abutment, a collar secured upon the plunger at the rear of the said nuts, guiding and retaining plates secured on said housing above and below the plunger and engaged With the rear end of said collar, a washer mount-ed upon the plunger against the rear side of said plates, a sleeve bearing against and nuts mounted on the. plunger and providing a bearing for the rear end of said cushion.

11. In an ap aratus for the purpose set forth, the combination of a brake shoe, tension devices cooperating with thebrake shoe, a plunger pivotally mounted on the brake shoe, means for frictionally resisting pivotal said washer, a cushion housed in said sleeve,

movement of the plunger, an abutment in i the path of the plunger, and means for yieldably checking movement of the plunger toward the abutment-and imparting a return movement thereto.

. In testimon whereof I'aflix my signature. TELESP ORE C. DEMERS. [L. s.] 

